This particular piece of advice is something I want to highlight:
Learn about system administration. I don't have much data to back this, but I've found that many of the famously successful hackers have at one time in their careers been sysadmins. E.g., ESR, Robert Morris, Tim O'Reilly, and many more. Try browsing resumes of your hacker heroes and see if any of them don't have this qualification. Such work gives you an important practical perspectives on usage patterns, systems topologies, hardware limitations, lifecycles, automation, tool availability, user-friendliness, user-stupidity, etc.
This is very important piece of advice-- any great developer should be a minimally competent sysadmin (and any great sysadmin should be a minimally competent developer).
Learn about system administration. I don't have much data to back this, but I've found that many of the famously successful hackers have at one time in their careers been sysadmins. E.g., ESR, Robert Morris, Tim O'Reilly, and many more. Try browsing resumes of your hacker heroes and see if any of them don't have this qualification. Such work gives you an important practical perspectives on usage patterns, systems topologies, hardware limitations, lifecycles, automation, tool availability, user-friendliness, user-stupidity, etc.
This is very important piece of advice-- any great developer should be a minimally competent sysadmin (and any great sysadmin should be a minimally competent developer).